String.prototype.ltrim = function(){
	var re = /\s*((\S+\s*)*)/;
	return this.replace(re, "$1");
}

String.prototype.rtrim = function(){
	var re = /((\s*\S+)*)\s*/;
	return this.replace(re, "$1");
}

String.prototype.rtrim = function(){
	return this.ltrim().rtrim();
}